Day-date timepiece advancing and correcting device

ABSTRACT

Day-date timepiece with unitary advancing pawls for day-date indicators with abutting means to lock one of the indicators with its respective pawl while the other indicator can be reset.

[ 5] Nov. 13, 1973 References Cited UNITED STATES PATENTS DAY-DATETIMEPIECE ADVANCING AND CORRECTING DEVICE Inventors: Gerald Visconti;Theo Miiller, both FOREIGN PATENTS OR APPLICATIONS of Soleu're,Switzerland [73] Assignee: Roamer Watch Co., S.A., Soleure,

Switzerland 367,760 11/1962 Switzerland.............................58/58 221 Filed: Feb. 15, 1973 Appl. No.: 332,687

Primary Examiner-George H. Miller, Jr. Att0rneyl. Irving Silverman etal.

[57] ABSTRACT Day-date timepiece with unitary advancing pawls forday-date indicators with abutting means to lock one of 58/58 theindicators with its respective pawl while the other G04b 19/24 indicatorcan be reset. Field of 5 Claims, 1 Drawing Figure 51 int.

DAY-DATE TIMEPIECE ADVANCING AND CORRECTING DEVICE The present inventionhas for object a timepiece comprising two indicating members which aremoved step by step, driven respectivelyby two pawls operatingsimultaneously and intermittently, and which act each on a toothingprovided on each indicating member.

This timepiece is characterized by the fact that it comprises a movableabutting member interposed between the two pawls, the whole beingarranged in such a way that this abutting member acts on the pawls forpreventing them from being simultaneously lifted and from releasing thussimultaneously the two indicating members while, when only one of themtends to be lifted, it moves the said abutting member towards the otherpawl, that permits it to be lifted and to release the indicating memberwith which it cooperates.

The drawing shows, by way of example, one embodiment of the object ofthe invention.

The sole FIGURE of the drawing is a plane view of a part of a calendarwatch in which only the elements necessary to the understanding of theinvention have been represented.

The watch as represented comprises an annular crown 1 carrying the 31figures of the dates, not represented, and which, thereby, indicates thedates. This crown l is provided with an inner toothing 1a which permitsdriving. The watch comprises moreover an indicating member 2 carryingthe names of the days of the week, not represented, and which, thereby,indicates the days of the week. This indicating member 2 is situated inthe center of the movement and is, consequently, coaxial to the crown 1;it is provided with an outer toothing 2a permitting driving. Thestepwise driving of the two indicating members 1 and 2 is effectedsimultaneously by means of a rocking control lever 3 provided with tworesilient arms 3a and 3b constituting two pawls cooperating respectivelywith the toothings 1a and 2a. This rocking lever 3 is provided with asole 3c, secured to the frame of the movement, to which it is connectedby a thin portion 3d, elastically deformable, constituting the returnspring of the said rocking lever. This rocking lever is provided with abeak 3 e cooperating with a snail shaped cam 4 driven by a wheel 5making one revolution per 24 hours, driven by the gearing of themovement, which has not been represented. During the rotation of thewheel 5, the rocking lever 3 is lifted by the cam 4 and, at eachrevolution of the cam, it falls again, its beak leaving the noze of thecam 4, that produces the instantaneous jump of the two indicatingmembers 1 and 2 in the direction of the arrows 6 and 7, respectively.Two jumpers, constituted by the two resilient arms 8a and 8b of anelement 8 secured to the frame of the movement, cooperate each with oneof the indicating members 1 and 2 for holding them stationary when theyare not driven.

The present watch comprises moreover a control stem 9, diagrammaticallyrepresented, operating a correcting wheel 10, which is a sliding wheel,rigid with a star-wheel, not represented, which cooperates with one orthe other of the toothings 1a and 2a, according to the direction inwhich is rotated the stem 9. This mechanism permits the manualcorrection of the indicating members of the dates and of the days.

An abutting member 11 having the shape of a triangle articulated in thevicinity of one of its apexes, at 12, on the frame of the movement, isinterposed between the two pawls 3a and 3b driving the two indicatingmembers. This abutting member cooperates with the pawls by means of itstwo sides adjacent to the apex in the vicinity of which it isarticulated and thus prevents the pawls from being lifted simultaneouslyand from releasing the two indicating members 1 and 2, thus preventingany untimely movement thereof, especially at the end of theirinstantaneous jump which, by reason of the inertia of the saidindicating members, could go beyond the value of one tooth.

On the other side, when one of the indicating members 1 or 2 is driven,by means of the correcting mechanism manually operated comprising thestem 9, this one of the indicating members which is operated lifts itsdriving pawl, which can effect this movement owing to the fact that itdisplaces itself and the abutting member 11 towards the other pawl.Thus, the locking mechanism does not prevent the displacements of onlyone of the two indicating members, under the action of the correctingmechanism manually operated, while it prevents any untimely simultaneousmovement thereof.

What we claim is l. Timepiece comprising two indicating members whichare moved step by step, driven respectively by two pawls operatingsimultaneously and intermittently, and which act each on a toothingprovided on each indicating member, a movable abutting member interposedbetween the two pawls, means for correcting the setting of eitherindicator, the abutting member moving towards one or the other pawlduring a correction operation, the pawl it moves towards being locked inplace while the other is released for the correction operation.

2. Timepiece as claimed in claim 1, characterized by the fact that thetwo pawls are made of one piece.

3. Timepiece as claimed in claim 1, characterized by the fact that thetwo indicating members are coaxial to each other and are provided onewith an outer toothing and the other with an inner toothing.

4. Timepiece as claimed in claim 1, characterized by the fact that theabutting member is constituted by an element hangedly mounted betweenthe two pawls.

5. Timepiece as claimed in claim 4, characterized by the fact that theabutting member is an element of triangular shape articulated in thevicinity of one of its apexes, this triangular element cooperating withthe pawls by means of its 'two sides which are adjacent to the apex inthe vicinity of which it is articulated.

1. Timepiece comprising two indicating members which are moved step bystep, driven respectively by two pawls operating simultaneously andintermittently, and which act each on a toothing provided on eachindicating member, a movable abutting member interposed between the twopawls, means for correcting the setting of either indicator, theabutting member moving towards one or the other pawl during a correctionoperation, the pawl it moves towards being locked in place while theother is released for the correction operation.
 2. Timepiece as claimedin claim 1, characterized by the fact that the two pawls are made of onepiece.
 3. Timepiece as claimed in claim 1, characterized by the factthat the two indicating members are coaxial to each other and areprovided one with an outer toothing and the other with an innertoothing.
 4. Timepiece as claimed in claim 1, characterized by the factthat the abutting member is constituted by an element hangedly mountedbetween the two pawls.
 5. Timepiece as claimed in claim 4, characterizedby the fact that the abutting member is an element of triangular shapearticulated in the vicinity of one of its apexes, this triangularelement cooperating with the pawls by means of its two sides which areadjacent to the apex in the vicinity of which it is articulated.